A few decades ago I ran a list of all MMs. It was in the neighborhood of N=700. Maybe someone knows, but I am guessing that this data is electronically transmitted to all in case of some security "event." Not sure. Anyway, we have PACER for a "heads up" and we tend to keep each other informed. 8)
Register for free to join our community of investors and share your ideas. You will also get access to streaming quotes, interactive charts, trades, portfolio, live options flow and more tools.